Heater System: Removal & Installation Chevrolet Pickup C3500

Removal & Installation

Actuator motor is located on top of heater case. Remove instrument panel. Unplug electrical connectors. Remove actuator motor. To install, reverse removal procedure.

1. Disconnect negative battery cable. Remove glove box. Remove front screw from right door sill plate. Remove right cowl kick panel. Unplug connector from Electronic Control Module (ECM) if necessary. Unplug connector from blower motor. Remove blower motor cover and cooling tube.
2. Remove bolt from right dash support. Remove blower motor flange screws. Pull blower motor forward carefully to avoid distorting blower fan. Remove blower motor. To install, reverse removal procedure.

1. Disconnect negative battery cable. Remove instrument panel bezel. Remove control assembly screws. Pull control assembly away from instrument panel.
2. Disconnect control cables. Unplug connectors. Remove control assembly. Remove blower switch knob and retaining clip. Remove blower switch. To install, reverse removal procedure.

1. Disconnect negative battery cable. Remove glove box. Remove center floor duct. Remove Electronic Control Module (ECM) and tray. Remove kick panel. Remove blower motor cover and blower motor.
2. Remove steering wheel. Tilt dash panel back. Remove coolant recovery reservoir. Drain engine coolant. Disconnect heater hoses at core. Remove heater case. Remove heater case cover plate.
3. Remove screws and bracket attaching core to case. (Scheme 1) Remove core. To install, reverse removal procedure. Fill cooling system. Start engine and check for leaks.

Scheme 1

Disconnect negative battery cable. Remove instrument panel bezel. Remove control assembly screws. Disconnect cables from control assembly. (Scheme 2) Remove glove box and glove box door as an assembly. Remove cable retaining clip. Disconnect cables. To install, reverse removal procedure. Check cable operation.

Scheme 2

Disconnect negative battery cable. Remove right rear trim panel cover. Unplug electrical connector. Remove blower motor. To install, reverse removal procedure.

1. Disconnect negative battery cable. On vehicles with switch mounted overhead, go to next step. On vehicles with switch mounted on instrument panel, remove instrument panel bezel. Unplug connector. Remove control switch. To install, reverse removal procedure.
2. Remove overhead console (if necessary). Unplug connectors from control assembly. Remove screws and control assembly. Remove switch. To install, reverse removal procedure.

Disconnect negative battery cable. Drain engine coolant. Remove right rear wheelwell panel. Remove right rear trim panel cover. Disconnect heater hoses from heater core. Unplug connector from heater assembly. Remove heater case cover. Remove heater core. To install, reverse removal procedure. Fill cooling system. Start engine and check for leaks.